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Finding the Fourth Proportional to 1,409.50, 2,114.54 and 485.19

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Solution

The fourth proportional to 1,409.50, 2,114.54 and 485.19 is: 727.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.50 : 2,114.54 = 485.19 : x
  2. Step 2: Convert to fraction form
    1,409.50/2,114.54 = 485.19/x
  3. Step 3: Cross multiply
    1,409.50x = 2,114.54 × 485.19
  4. Step 4: Simplify right side
    1,409.50x = 1,025,953.06
  5. Step 5: Solve for x
    x = 1,025,953.06/1,409.50
  6. Step 6: Final answer
    x = 727.88

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.